Special Forums Cybersecurity Failed SSHD Login Attempts (15,000 per day) - Is that a lot compared to your server? Post 303039216 by Neo on Thursday 26th of September 2019 06:08:45 AM
Failed SSHD Login Attempts (15,000 per day) - Is that a lot compared to your server?

The purpose of this thread is for everyone to follow the same methodology so we can create a future table, for the benefit of all, that shows how many failed login attempts (hacking) per day per server (and per minute) are happening.

This is not a thread on writing scripts or creating different methods to get the same data; nor it this a thread on how to prevent brute force logins; This thread has a a very simple (not elegant, not interesting) method that everyone can follow and by using the same very simple method, the results will be easy to compare, apples to apples, as follows:

lastb | wc -l

lastb | head -1
root     ssh:notty   Thu Sep 26 00:50 - 00:50  (00:00)

lastb | tail -1
btmp begins Wed Sep  4 06:52:54 2019

Days Total (approx): 22

330466 / 22 = 15K ssh login attempts which failed each day, or about 10.4 per minute.

Is that a lot compared to your server?

Please post back your results using the same method:


lastb | head -1

lastb | tail -1

Then take the totals days by comparing the dates in the head and tail, and divide that (the days) into the total number from the lastb | wc -l command and post back (just like I did above)


PS: If all replies use the same method, it will be easy to compare the results in a table or chart later. Please do not use any other method than the very simple one above.


If we get enough replies, I will do a video on the results later.
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LAST,LASTB(1)						Linux System Administrator's Manual					     LAST,LASTB(1)

last, lastb - show listing of last logged in users SYNOPSIS
last [-R] [-num] [ -n num ] [-adiox] [ -f file ] [ -t YYYYMMDDHHMMSS ] [name...] [tty...] lastb [-R] [-num] [ -n num ] [ -f file ] [ -t YYYYMMDDHHMMSS ] [-adiox] [name...] [tty...] DESCRIPTION
Last searches back through the file /var/log/wtmp (or the file designated by the -f flag) and displays a list of all users logged in (and out) since that file was created. Names of users and tty's can be given, in which case last will show only those entries matching the arguments. Names of ttys can be abbreviated, thus last 0 is the same as last tty0. When last catches a SIGINT signal (generated by the interrupt key, usually control-C) or a SIGQUIT signal (generated by the quit key, usu- ally control-), last will show how far it has searched through the file; in the case of the SIGINT signal last will then terminate. The pseudo user reboot logs in each time the system is rebooted. Thus last reboot will show a log of all reboots since the log file was created. Lastb is the same as last, except that by default it shows a log of the file /var/log/btmp, which contains all the bad login attempts. OPTIONS
-num This is a count telling last how many lines to show. -n num The same. -t YYYYMMDDHHMMSS Display the state of logins as of the specified time. This is useful, e.g., to determine easily who was logged in at a particular time -- specify that time with -t and look for "still logged in". -R Suppresses the display of the hostname field. -a Display the hostname in the last column. Useful in combination with the next flag. -d For non-local logins, Linux stores not only the host name of the remote host but its IP number as well. This option translates the IP number back into a hostname. -i This option is like -d in that it displays the IP number of the remote host, but it displays the IP number in numbers-and-dots nota- tion. -o Read an old-type wtmp file (written by linux-libc5 applications). -x Display the system shutdown entries and run level changes. NOTES
The files wtmp and btmp might not be found. The system only logs information in these files if they are present. This is a local configura- tion issue. If you want the files to be used, they can be created with a simple touch(1) command (for example, touch /var/log/wtmp). FILES
/var/log/wtmp /var/log/btmp AUTHOR
Miquel van Smoorenburg, miquels@cistron.nl SEE ALSO
shutdown(8), login(1), init(8) Jul 29, 1999 LAST,LASTB(1)

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